If this is one of the old 600 model series from Japan, and it has a BDC option (dual horizontal crosshairs), the threads may be stripped on the plastic cap or sleeve that engages the elevation screw (common problem). The cap may also be cracked. You may have to be on the lookout (ebay, gunbroker, etc.) for a replacement cap. In the meantime, you can just remove the plastic cap and use a screwdriver to turn the metal screw on the scope body under that cap to adjust elevation. If this does not solve the problem, there is a scope repair shop that specializes in repairing vintage scopes (Ross, Ohio). This work would be beyond the "scope" of an amateur. Hope this helps. erik7x57

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Try this:
If you are at the extreme left adjustment limit..........
turn the l/r dial all the way to the right and count the clicks. Turn the dial back 1/2 the number of clicks counted. you are at center point. Shoot one round at target. Elevation is unchanged and you should be on paper. Put up a 4x4 poster board with a 3 inch black circle as your aim point. Walk the bullet to center of black spot one shot at a time. DO NOT HEAT UP BARREL AND EXPECT ACCURACY!! If this does not work......toss scope and start over!

I think you will very unhappy if you mount it on the carry handle.
I suggest removing it and getting a Nikon M-223 mount, YOu might also want
to check out the M-223 line of scopes. The 3-12x42 with Rapid Action Turret might
really surprise you. I don't have one freind who hasn't tried mine out and not bought one.
Hard to argue with that. Check out Nikonhunting.com
Bart
Nikon Pro Staff

Take the bolt out of the rifle so you can sight down the barrel to the target. Get the target bullseye in the center of the barrel. Now look through the scope to see where it is. Adjust the windage and elevation screws to get the cross hairs on the bullseye. Look through the barrel several times to make sure the gun did not move off the target during the adjustments. A concrete bench with sandbags is best to use for this.

For eye relief you need to loosen the scope in the rings, mount the rifle to your shoulder with your standard hold and cheek weld. At this point, slide the scope back and forth in the rings until you obtain a full field of view. Tighten one of the rings slightly, dismount and remount the rifle several times to ensure correct adjustment. Level scope and tighten rings a final time.

For focus adjustment (remember that you are using the eyepiece to focus on the cross hair, not your target!) loosen the lock ring and turn the eyepiece until the cross hair is focused. It is best if you check it several times by closing and opening your eye several times. The crosshair should be instantly in focus. If your eye must adjust, then you need to refocus until the focus is instant.

The two dials on the scope are for adjusting the bullet point of impact. They will typically move POI 1/4 inch at 100 yards.